9 CFR § 310.20 - Saving of blood from livestock as an edible product.
Blood may be saved for edible purposes at official establishments provided it is derived from livestock, the carcasses of which are inspected and passed, and the blood is collected, defibrinated, and handled in a manner so as not to render it adulterated under the Federal Meat Inspection Act and regulations issued pursuant thereto. The defibrination of blood intended for human food purposes shall not be done with the hands. Anticoagulants may be used in accordance with 21 CFR chapter I, subchapter A and subchapter B, or by regulation in 9 CFR chapter III, subchapter A or subchapter E.
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